With Justine on this one. Not a good idea. Not only could they choke, but they may get use to having the teat in their mouth, which could mean big problems if and when it falls out. And by big problems I mean they might wake up! I don't know about others, but when we first brought our son home from the hospital, I would get incredibly anxious listening to him through the monitor when he was sleeping. I would think 'Gosh, please don't wake up yet. Sleep. Sleeeep.' That, plus you may have problems weaning them off it or with tooth decay.